"Sone efftyre, at the Yule deit he; Swa litill mare than a halff yere Lestyt he in his powere."[240] The latter years of the same century witnessed one of the most important events in the history of Dumbarton Castle. In 1488, it was entrusted to the keeping of the Earl of Lennox and his eldest son, Matthew Stuart, who, in the course of the following year, engaged, with Lord Lyle and others, in a conspiracy for the overthrow of the Government, and fortified the stronghold accordingly. Repeated summons to surrender having been disregarded, messengers were dispatched through the whole county to convoke the militia; and it was arranged that, whilst James proceeded in person to Crookston and Duchal, Colin, first Earl of Argyle, should lay siege to Dumbarton Castle; and elaborate preparation was made for the transport of the most powerful artillery of the day, including the famous Mons Meg, into the rebellious West. The smaller strongholds were soon reduced, but the Rock held out, and the defenders, making a vigorous sally, dislodged their assailants by burning the town, and so raised the siege. The Royal forces, on being thus driven off, fell back upon Dunglas, where new materials were quickly collected, another great gun, "callit Duchal", being brought from Arkil, near Paisley, the boats conveyed overland from Daldres--the present Grangemouth--and from Blackness. With all this, it was not till the second week in December, fully seven months after the commencement of operations, that the stronghold was obliged to surrender. A formal sentence of forfeiture and death was passed on Lennox and his son, but annulled on their appeal by reason of some technical flaw. Passing over the lesser siege of 1513-14, the occupation of 1543 in the interest of Henry VIII, the departure of the child-queen Mary, in 1548, and other events of slighter importance, we come to the most sensational episode of all. It was after Langside. Lord Fleming had returned from accompanying Queen Mary to England, and had resumed his governorship of the fortress which he held for her. The Regent Murray was desirous of obtaining possession of so important a position, and, negotiations having failed, went down in person to open the siege. So strict was the blockade that Fleming was on the point of surrendering when the assassination of Murray brought him some respite. Lennox, who succeeded as Regent, was equally bent on the capture of the Castle, and endeavoured to obtain help from England. But Elizabeth was opposed to hostile measures, and sent Drury to reopen negotiations with Lord Fleming and John Hamilton, Bishop of St. Andrews, who was with him. The mission nearly proved fatal to the English ambassador. He was enticed within gunshot and deliberately, though unsuccessfully, fired upon.[241] This dastardly attempt is the subject of a contemporary poem entitled _The Tressoun of Dunbartane_.